Dear list:
When burning DVD with growisofs at speed 5x the SuSE 10.2 system become
very slow, most notably mouse is moving slow, for example: I type a
letter in this email (right now it's burning DVD) the letter appear 0.5
to 1.5 seconds after I typed.
First I thought maybe burning DVD is very CPU consuming, but later I see
not even 15% CPU resource is being used, also I have Pentium D, that is
there should be another CPU that's free, even if a process takes up 100%
CPU.
Memory? Still more than 700MB free memory (a.k.a 700MB cached memory)
Then I think it's maybe IDE HDD cannot be efficient if two processes are
reading it the same time (growisofs is reading it, thus any other
application using HDD become the second application). But, I am wrong!
The source data of the DVD is on a NFS share so IDE bandwidth is not
taken up.
Later I think is it possible it's that PCI bandwidth is used up? The
network card is on the motherboard, there are 12 video chip on this
computer (grouped by 4 on total of 3 PCI bus), although only 3 of the
monitors are active (others are in power-saving mode). I don't know any
tool I can use to test if PCI bandwidth is used up and video display is
being slowed down. But... if instead of burning DVD I do
'cat /mnt/nfs/data.iso > /dev/null', the network is at full speed
(8MBytes/s) and the system is not slowed down (mouse/keyboard still very
fast).
So.. what's the real bottle-neck that slows my system down when burning
DVD? Not a big problem because I can tolerate this slow, only curious...
P.S. diagnostic information:
> uptime
4:00pm up 18:02, 9 users, load average: 3.14, 3.05, 2.36
> free -m
total used free shared buffers cached
Mem: 2019 1891 128 0 16 719
-/+ buffers/cache: 1154 864
Swap: 2055 0 2054
> top
top - 16:01:39 up 18:04, 9 users, load average: 3.24, 3.10, 2.30
Tasks: 263 total, 1 running, 256 sleeping, 0 stopped, 6 zombie
Cpu(s): 14.4%us, 1.7%sy, 0.0%ni, 83.1%id, 0.8%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2068136k total, 1990408k used, 77728k free, 18008k buffers
Swap: 2104472k total, 252k used, 2104220k free, 756212k cached
--
Zhang Weiwu
Real Softservice
http://www.realss.com
+86 592 2091112
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